While doing some surveys on one of my Breeding Bird Atlas routes today I found a well constructed nest with this nestling inside. I moved away so the parent would return and a Yellow Warler came to feed this very young hatchling. In fact, I think this hatchling doesn't even have it's eyes open yet (though clearly it's beak does open uite wide).

It's interesting that the plumage on this hatchling, gray, matches it's nest so well that the bird almost looks like part of the nest (except for it's beak and gape).
SeEtta